Comment 6 for bug 1480724

That sounds like an odd configuration; for next steps, I'd try this:

sudo apt-get update

Some warnings about old indexes are fine to ignore (Translations_EN, for example, isn't really a big deal) but others may indicate that your mirror is out of date or broken. Maybe run the command a few times, you may get a different mirror the second or third runs.

Once that runs well enough, try this:

sudo apt-get -u dist-upgrade

That will download any new security or reliability updates, and hopefully run some previously-blocked maintenance scripts.

Thanks